Strings/Quantum Gravity 5

          @misc{ scivideos_PIRSA:06060016,
            doi = {10.48660/06060016},
            url = {https://pirsa.org/06060016},
            author = {Sorkin, Rafael},
            keywords = {},
            language = {en},
            title = {Strings/Quantum Gravity 5},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2006},
            month = {jun},
            note = {PIRSA:06060016 see, \url{https://scivideos.org/pirsa/06060016}}
          }